<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JavaScript函数</title>
</head>
<body>
    <script>
        function hello(){
            console.log('Hello');
        }
        hello();
        function hello_return(){
            return '我是返回值'
        }

     let hel=   hello_return();
     console.log(hel);

    //  作用域
    </script>
</body>
</html>